A comparison of maximum cystometric bladder capacity with maximum environmental voided volumes

Abstract

The aim of the study was, to determine whether maximum cystometric capacity accurately reflects the maximum functional bladder volume in women with urinary incontinence. We performed a retrospective chart review involving 85 women between the ages of 22 and 89 with primary complaints of urinary incontinence. The maximum cystometric capacity as determined by cystometry was compared with the maximum environmental voided volumes as recorded in a 24-hour voiding diary, using Pearson's correlation coefficients and paired t-tests. Patients diagnosed as having a small bladder capacity (< 300 ml maximum volume) based on cystometry were also examined with contingency table analysis to determine whether the bladder volumes in the voiding diaries supported the diagnosis of a small bladder. In 85 subjects the average maximum cystometric capacity was 14.7% less than the maximum volume recorded in the voiding diary. The correlation between the maximum cystometric capacity and maximum functional bladder volume was r = 0.473 (P < 0.001). However, there was a statistically significant difference between the two volumes by paired t-test analysis (P = 0.006). Using cystometry to diagnose small bladder capacity showed a sensitivity of 62.9% and a specificity of 71.2% when using voiding diary volumes as the criterion standard. The positive predictive value was 51.4% and the negative predictive value was 84.0%. These results suggest that whereas the maximum bladder capacity measured by cystometry correlates with maximum environmental bladder capacity as determined by 24-hour voiding diaries, there is a statistically significant difference. The diagnosis of a small bladder should not be based on office cystometry alone.

Evaluation of Bladder Diary Parameters Based on Correlation with the Volume at Strong Desire to Void in Filling Cystometry

“…However, in a similar study, Ertberg et al reported the same correlation to be poor [4]. In our study, we found that the maximum daytime void volume excluding first morning void was well-correlated with VSD determined by filling cystometry (ρ = 0.43 to 0.51, all P <0.001), similar to Yoon and Swift [15]. Ertberg et al and Yoon and Swift both reported that the bladder diary capacity was significantly higher than cystometry capacity (400 ml vs. 215 ml [median], P  = 0.017 [4]; and 401 ml vs. 342 ml [mean] [15]).…”

“…In our study, we found that the maximum daytime void volume excluding first morning void was well-correlated with VSD determined by filling cystometry (ρ = 0.43 to 0.51, all P <0.001), similar to Yoon and Swift [15]. Ertberg et al and Yoon and Swift both reported that the bladder diary capacity was significantly higher than cystometry capacity (400 ml vs. 215 ml [median], P  = 0.017 [4]; and 401 ml vs. 342 ml [mean] [15]). McCormack et al reported that bladder capacity from cystoscopy was higher than that from bladder diary by 206 ml [16].…”

“…Yoon and Swift reported a good correlation between maximum bladder capacities determined from bladder diary and filling cystometry (ρ = 0.47, P <0.001) [15]. However, in a similar study, Ertberg et al reported the same correlation to be poor [4].…”

Does sensory bladder function during cystometry differ from that in daily life? A study in incontinent women

“…2 Bladder behavior studied with cystometry or with bladder diary has been shown to give different results. 3,4 Several studies have shown that bladder motor function, capacity, compliance depend on filling speed. [5][6][7] To our knowledge, there is no study available comparing bladder volumes related to different grades of desire to void between the SR-BD and cystometric bladder filling (CBF) in women with urinary incontinence (UI).…”

Bladder sensations in male and female overactive bladder patients compared to healthy volunteers: a sensation-related bladder diary evaluation

“…Bladder sensations have been studied mostly with the use of invasive cystometry [7,8]. However, it has been demonstrated that the rate of filling in cystometry or even the use of a catheter gives distorted results [9][10][11]. Therefore, it has been recommended that evaluation of bladder sensations during daily activities is the most representative [9].…”